The Variable Swirl Actuator is installed in between the two intake manifolds and consists of a DC motor which actuates the swirl valve and a position sensor which detects the position of the swirl valve. This swirl system optimizes air flow entering into combustion chamber of each cylinder in accordance with the various engine conditions.
[At High Speed or High Load] Swirl valve opening → Swirl amount decreasing → Swirl effect increasing → Pumping loss decreasing → Engine power increasing
[At Low/Middle Speed or Low Load] Swirl valve closing → Swirl amount increasing → Air/fuel mixture increasing → EGR amount enlarging → Emission reducing
After replacing the Variable Swirl Actuator, MUST perform the "COMPONENT CHANGE ROUTINE" procedure (Refer to "REPLACEMENT" procedure). Otherwise trouble related with engine performance or emission control may occur until ECM learning about the component is over.
Items | High Speed or High Load | Low/Middle Speed or Low Load |
Engine Speed | More than 3,000rpm | Less than 3,000rpm |
Swirl Valve | Opening | Closing |
Swirl Quantity | Little | Much |
Effect | Swirl effect increasing → Pumping loss decreasing → Engine power increasing | Air/Fuel mixture increasing → EGR amount enlarging → Emission reducing |
Description illustration |  |  |
Fail-safe | Fully opened | |
To prevent the swirl valve and its shaft from being stuck by foreign material and to learn maximum opening and closing position of the valve, the ECM fully opens and closes the valve twice when engine is being stopped.
